/*---------------------------------------------------------------------------*\
OneFLOW - LargeScale Multiphysics Scientific Simulation Environment
Copyright (C) 2017-2019 He Xin and the OneFLOW contributors.
-------------------------------------------------------------------------------
License
This file is part of OneFLOW.

OneFLOW is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

OneFLOW is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with OneFLOW.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/
#pragma once
#include "HXType.h"
#include <vector>
#include <fstream>
#include <string>
using namespace std;

BeginNameSpace( ONEFLOW )

class DataPage
{
public:
	DataPage();
	~DataPage();
public:
	typedef vector< char > CharMemory;
public:
	UInt GetSize();
	void Read ( void * data, UInt dataSize );
	void Read ( void * data, UInt dataSize, UInt position );
	void Write( void * data, UInt dataSize );
	void Write( void * data, UInt dataSize, UInt position );
	void ReadFile ( fstream & file );
	void WriteFile( fstream & file );
	void ToString( string & str );

	char * GetBeginDataPointer();
	char * GetCurrentDataPointer();

	void MoveToBegin() { MoveToPosition( 0 ); };
	void MoveToEnd  () { currPos = GetSize(); };
	void ReSize( UInt newSize );
	void Send( int pId, int tag );
	void Recv( int pId, int tag );
	void Bcast( int rootid );
protected:
	void MoveToPosition( UInt position );
	void MoveForwardPosition( UInt dataSize );
protected:
	UInt currPos;
	CharMemory * dataMemory;
public:
	char * GetDataPointer( int begin ) { return &( ( * dataMemory )[ begin ] ); }
};

EndNameSpace
